String schemas are updated on every terraform run due to missing string_attribute_constraints attribute

[mhorbul]

Terraform CLI and Terraform AWS Provider Version

Terraform v1.0.6
AWS provider 3.63.0

Affected Resource(s)

aws_cognito_user_pool

Affected Module Attrinbute(s)

string_schemas
number_schemas

Terraform Configuration Files

module "cognito_user_pool" {
  source  = "lgallard/cognito-user-pool/aws"
  version = "0.20.1"

  user_pool_name      = "Default"
  username_attributes = ["email"]
 
   .... 
   string_schemas = [
     {
      attribute_data_type      = "String"
      developer_only_attribute = false
      mutable                  = true
      name                     = "groups"
      required                 = false

      string_attribute_constraints = {}
     },
     {
      attribute_data_type      = "String"
      developer_only_attribute = false
      mutable                  = true
      name                     = "email"
      required                 = true

      string_attribute_constraints = {
        max_length = "2048"
        min_length = "0"
      }
    }
 ]
}

Expected Behavior

Pool is created with string schemas and terraform does not try to update them on the following terrafrom execution.

Actual Behavior

  # module.cognito_user_pool.aws_cognito_user_pool.pool[0] will be updated in-place
  ~ resource "aws_cognito_user_pool" "pool" {
        id                         = "us-east-1_ABCDE1234"
        name                       = "Default"
        tags                       = {
            "Terraform"   = "true"
        }
        # (14 unchanged attributes hidden)

      - schema {
          - attribute_data_type      = "String" -> null
          - developer_only_attribute = false -> null
          - mutable                  = true -> null
          - name                     = "groups" -> null
          - required                 = false -> null

          - string_attribute_constraints {}
        }
      + schema {
          + attribute_data_type      = "String"
          + developer_only_attribute = false
          + mutable                  = true
          + name                     = "groups"
          + required                 = false
        }
      + schema {
        }

        # (11 unchanged blocks hidden)
    }

Steps to Reproduce

1. terraform apply
2. terraform apply

[smadi0x86]

Using version 0.24.0, Still same issue here, the config:
{
name = "tenantID"
attribute_data_type = "String"
mutable = true
required = false
developer_only_attribute = false
string_attribute_constraints = {}
},
{
name = "userRole"
attribute_data_type = "String"
mutable = true
required = false
developer_only_attribute = false
string_attribute_constraints = {}
},
{
name = "userOrganization"
attribute_data_type = "String"
mutable = true
required = false
developer_only_attribute = false
string_attribute_constraints = {}
}

Behaviour on every terraform plan/apply:

    # (13 unchanged attributes hidden)

  - schema {
      - attribute_data_type      = "String" -> null
      - developer_only_attribute = false -> null
      - mutable                  = true -> null
      - name                     = "tenantID" -> null
      - required                 = false -> null

      - string_attribute_constraints {}
    }
  - schema {
      - attribute_data_type      = "String" -> null
      - developer_only_attribute = false -> null
      - mutable                  = true -> null
      - name                     = "userOrganization" -> null
      - required                 = false -> null

      - string_attribute_constraints {}
    }
  - schema {
      - attribute_data_type      = "String" -> null
      - developer_only_attribute = false -> null
      - mutable                  = true -> null
      - name                     = "userRole" -> null
      - required                 = false -> null

      - string_attribute_constraints {}
    }
  + schema {
      + attribute_data_type      = "String"
      + developer_only_attribute = false
      + mutable                  = true
      + name                     = "tenantID"
      + required                 = false
    }
  + schema {
      + attribute_data_type      = "String"
      + developer_only_attribute = false
      + mutable                  = true
      + name                     = "userOrganization"
      + required                 = false
    }
  + schema {
      + attribute_data_type      = "String"
      + developer_only_attribute = false
      + mutable                  = true
      + name                     = "userRole"
      + required                 = false
    }
  + schema {
    }

    # (10 unchanged blocks hidden)
}

Plan: 0 to add, 1 to change, 0 to destroy.

[chris-symbiote]

We're also seeing this, I've raised an MR to bring the lifecycle block back:

#129

[smadi0x86]

Fixed it by removing the variables and declaring it in the main.tf directly as shown in the complete example (https://github.com/lgallard/terraform-aws-cognito-user-pool/blob/master/examples/complete/main.tf), I guess I was using it in variables.tf incorrectly, but just kept it as is without variables.